This ia an IOS app that uses augmented reality. It is wild, you print the "marker" which is a picture of a bunch of stones. Start the app and point your ios camera at the marker. Do not point it at a sharpie like I did the first time. It will not work. What you will see on your ios device is Curiosity, Grail, Voyager, Dawn, Cassini and Juno in 3D. You can move your device up or down to change your view. You can also rotate the paper to spin the craft. What a great app.